On the 4 hour chart, the short term trend on GBPUSD remain bullish. 1.6835 seems to be the key resistance for the pair, breaking which will give the uptrend continuation confirmation. The rising trend line is providing the necessary support to the pair. On the monthly chart,we can see that the pair is currently near the highs of November 2009. The monthly pivot at 1.6836 seems like a key resistance and stands in way of further upside. A breakout above this pivot will provide the confirmation of the continuation and may lead to a surge all the way up to 1.7041.